/Engine/Source/Runtime/Core/Public/Misc/CoreDelegates.h
Called when the user accepts an invitation to the current game
static [TMulticastDelegate](API\Runtime\Core\Delegates\TMulticastDelegate)< void(const [FString](API\Runtime\Core\Containers\FString) &, const [FString](API\Runtime\Core\Containers\FString) &)> OnInviteAccepted;